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參數(shù)資料
| 型號： | MMA1270EGR2 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Low G Micromachined Accelerometer |
| 中文描述： | 低摹微加速度計 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 238K |
| 代理商： | MMA1270EGR2 |
MMA1270EG
Sensors
Freescale Semiconductor
5
BASIC CONNECTIONS
Pinout Description
Figure 5. SOIC Accelerometer with Recommended
Connection Diagram
PCB Layout
Figure 6. Recommended PCB Layout for Interfacing
Accelerometer to Microcontroller
NOTES:
1. Use a 0.1
μ
F capacitor on V
DD
to decouple the power
source.
2. Physical coupling distance of the accelerometer to the
microcontroller should be minimal.
3. Place a ground plane beneath the accelerometer to
reduce noise, the ground plane should be attached to
all of the open ended terminals shown in
Figure 6
.
4. Use an RC filter of 1 k
and 0.1
μ
F on the output of the
accelerometer to minimize clock noise (from the
switched capacitor filter circuit).
5. PCB layout of power and ground should not couple
power supply noise.
6. Accelerometer and microcontroller should not be a
high current path.
7. A/D sampling rate and any external power supply
switching frequency should be selected such that they
do not interfere with the internal accelerometer
sampling frequency. This will prevent aliasing errors.
Table 3. Pin Descriptions
Pin No.
Pin Name
Description
1 thru 3
V
SS
Redundant connections to the internal
V
SS
and may be left unconnected.
4
V
OUT
Output voltage of the accelerometer.
5
STATUS
Logic output pin used to indicate fault.
6
V
DD
The power supply input.
7
V
SS
The power supply ground.
8
ST
Logic input pin used to initiate self-test.
9 thru 13
Trim pins
Used for factory trim.
Leave unconnected.
14 thru 16
—
No internal connection.
Leave unconnected.
V
SS
V
SS
V
SS
V
OUT
STATUS
V
DD
V
SS
ST
N/C
N/C
N/C
N/C
N/C
N/C
N/C
N/C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
8
MMA1270EG
ST
V
DD
V
SS
V
SS
V
OUT
OUTPUT
SIGNAL
R1
1 k
4
C2
0.1
μ
F
6
7
LOGIC
INPUT
V
DD
C1
0.1
μ
F
STATUS
5
3
2
1
V
SS
V
SS
P0
A/D In
V
RH
V
SS
V
DD
ST
V
OUT
V
SS
V
DD
0.1
μ
F
1 k
0.1
μ
F
0.1
μ
F
Power Supply
0.1
μ
F
P1
M
A
C
C
C
C
R
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|---|---|
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